I'm looking for stories about a specific saint, but I can't find their name in this book. Why would the Satcharitra leave out important figures?

I understand you are looking for information on a particular saint. The Shri Sai Satcharitra's focus is intentionally centered on fostering devotion to Sai. As Chapter 50 describes, the ultimate goal is not to be an encyclopedia but to help one achieve a 'natural state' (Sahaj-sthiti) of non-dual devotion. The text suggests we should not be indifferent to our own welfare by getting distracted, comparing this to one who finds a pearl but discards it over the shell's origin. The book's purpose is to use the stories of Saints that fall on the ears to ensure 'not a trace of sin remains' and to awaken a devotion that purifies the heart.